Buy a roll of transparent tape in the bandage isle of your favorite store. Bobbie bought Curad brand and hers cost less than $2. I bought the same thing only at a different store and mine was the store brand and mine cost just over $4 with sales tax. Still this stuff is cheap and will last you a long time.
Believe me I have tried every type of ruler gripper in the past from sand paper dots, to clear dots (those were thick so the ruler sat up a bit too much), to that clear plastic cling stuff (which eventually would curl and pull away from the corners). All those grippers would only last so long and each package would only have enough to do a few rulers. So this tape is cheap and while I don't know how long it will last on my rulers, it is cheap enough and I have enough yardage to add more tape as needed.
I plan on using this on my plastic templates too, even the templates I make and cut out myself.
